6440321652 has 24 divisors (see below), whose sum is σ = 15087294432. Its totient is φ = 2138220000.

The previous prime is 6440321651. The next prime is 6440321663. The reversal of 6440321652 is 2561230446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440321651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1066099 + ... + 1072122.

It is an arithmetic number, because the mean of its divisors is an integer number (628637268).

Almost surely, 2^6440321652 is an apocalyptic number.

It is an amenable number.

6440321652 is an abundant number, since it is smaller than the sum of its proper divisors (8646972780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440321652 is a wasteful number, since it uses less digits than its factorization.

6440321652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138479 (or 2138477 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 6440321652 is about 80251.6146379623. The cubic root of 6440321652 is about 1860.5264679206.

The spelling of 6440321652 in words is "six billion, four hundred forty million, three hundred twenty-one thousand, six hundred fifty-two".